I have a bunch of the GT Electronics mics,
AM62, 61, 52, 51, 40.....but not the one in the picture.
Like any company/manufacturer that has disappeared, there's always rumors and legends that stir up about their products. I see some people get all excited about a particular Groove Tubes model/vintage on eBay, but I don't think Groove Tubes made any mics that were either exceptionally
stellar or bad. They just made good mics, and regardless of the vintage, like all mics, it comes down to flavor and personal taste....so give it a try on anything/everything and see what you like (or not) about it.
I like all my GT mics. I have a pair of AM52 (I actually have 2 pairs) permanently dedicated drum kit OH duties in an M/S configuration. I've use the 60 series (60 tube, 50 FET, 40 tube) on guitar cabs and some vox, and the 40 on piano and on acoustic, but not that often.
I mainly use 2-3 of my "current" favorite mics on everything these days...so a lot of the others will sit in their cases, but I like having a lot of mics. I've become somewhat spoiled with having a bunch of mics (though not anywhere near moresound's level of sickness
).
I don't do much multi-person stuff, so I have little need for putting out a lot of mics on a session. I've been into a couple
Cascade ribbon mics lately...and my ADK CC on vocals (that's pretty much
an absolute until I get something better than the CC).